add instancetype to class constructors

Author: Peyton Randolph

WebViewJavascriptBridge_iOS/WebViewJavascriptBridge_iOS.h

@@ -6,7 +6,7 @@
 @property (nonatomic, strong) UIWebView *webView;
 @property (nonatomic, strong) id <UIWebViewDelegate> webViewDelegate;
 
-+ (id)bridgeForWebView:(UIWebView*)webView handler:(WVJBHandler)handler;
-+ (id)bridgeForWebView:(UIWebView*)webView webViewDelegate:(id <UIWebViewDelegate>)webViewDelegate handler:(WVJBHandler)handler;
++ (instancetype)bridgeForWebView:(UIWebView*)webView handler:(WVJBHandler)handler;
++ (instancetype)bridgeForWebView:(UIWebView*)webView webViewDelegate:(id <UIWebViewDelegate>)webViewDelegate handler:(WVJBHandler)handler;
 
 @end

WebViewJavascriptBridge_iOS/WebViewJavascriptBridge_iOS.m

@@ -4,11 +4,11 @@ @implementation WebViewJavascriptBridge
 
 #pragma mark UIWebViewDelegate
 
-+ (id)bridgeForWebView:(UIWebView *)webView handler:(WVJBHandler)handler {
++ (instancetype)bridgeForWebView:(UIWebView *)webView handler:(WVJBHandler)handler {
     return [self bridgeForWebView:webView webViewDelegate:nil handler:handler];
 }
 
-+ (id)bridgeForWebView:(UIWebView *)webView webViewDelegate:(id<UIWebViewDelegate>)webViewDelegate handler:(WVJBHandler)messageHandler {
++ (instancetype)bridgeForWebView:(UIWebView *)webView webViewDelegate:(id<UIWebViewDelegate>)webViewDelegate handler:(WVJBHandler)messageHandler {
     WebViewJavascriptBridge* bridge = [[WebViewJavascriptBridge alloc] init];
     bridge.messageHandler = messageHandler;
     bridge.webView = webView;